全文获取类型
收费全文 | 1483篇 |
免费 | 37篇 |
国内免费 | 10篇 |
专业分类
安全科学 | 66篇 |
废物处理 | 50篇 |
环保管理 | 372篇 |
综合类 | 153篇 |
基础理论 | 446篇 |
污染及防治 | 259篇 |
评价与监测 | 117篇 |
社会与环境 | 50篇 |
灾害及防治 | 17篇 |
出版年
2023年 | 7篇 |
2022年 | 14篇 |
2021年 | 22篇 |
2020年 | 15篇 |
2019年 | 21篇 |
2018年 | 30篇 |
2017年 | 33篇 |
2016年 | 50篇 |
2015年 | 32篇 |
2014年 | 33篇 |
2013年 | 111篇 |
2012年 | 78篇 |
2011年 | 80篇 |
2010年 | 64篇 |
2009年 | 54篇 |
2008年 | 65篇 |
2007年 | 82篇 |
2006年 | 80篇 |
2005年 | 62篇 |
2004年 | 50篇 |
2003年 | 63篇 |
2002年 | 44篇 |
2001年 | 22篇 |
2000年 | 32篇 |
1999年 | 23篇 |
1998年 | 25篇 |
1997年 | 27篇 |
1996年 | 24篇 |
1995年 | 20篇 |
1994年 | 18篇 |
1993年 | 17篇 |
1992年 | 19篇 |
1991年 | 12篇 |
1990年 | 14篇 |
1989年 | 14篇 |
1988年 | 16篇 |
1987年 | 12篇 |
1986年 | 13篇 |
1985年 | 10篇 |
1984年 | 17篇 |
1983年 | 14篇 |
1982年 | 12篇 |
1981年 | 20篇 |
1980年 | 8篇 |
1979年 | 17篇 |
1978年 | 7篇 |
1977年 | 9篇 |
1976年 | 4篇 |
1968年 | 3篇 |
1964年 | 2篇 |
排序方式: 共有1530条查询结果,搜索用时 125 毫秒
501.
Laura Bouriaud Mariella Marzano Manfred Lexer Liviu Nichiforel Christopher Reyer Christian Temperli Heli Peltola Ché Elkin Gabriel Duduman Philip Taylor Stephen Bathgate Jose G. Borges Sandra Clerkx Jordi Garcia-Gonzalo Carlos Gracia Geerten Hengeveld Seppo Kellomäki Georgi Kostov Michael Maroschek Bart Muys Gert-Jan Nabuurs Bruce Nicoll Marc Palahí Werner Rammer Duncan Ray Mart-Jan Schelhaas Louise Sing Margarida Tomé Juergen Zell Marc Hanewinkel 《Regional Environmental Change》2015,15(8):1595-1609
502.
503.
Abigail Bennett Xavier Basurto John Virdin Xinyan Lin Samantha J. Betances Martin D. Smith Edward H. Allison Barbara A. Best Kelly D. Brownell Lisa M. Campbell Christopher D. Golden Elizabeth Havice Christina C. Hicks Peter J. Jacques Kristin Kleisner Niels Lindquist Rafaella Lobo Grant D. Murray Michelle Nowlin Pawan G. Patil Douglas N. Rader Stephen E. Roady Shakuntala H. Thilsted Sarah Zoubek 《Ambio》2021,50(5):981
The international development community is off-track from meeting targets for alleviating global malnutrition. Meanwhile, there is growing consensus across scientific disciplines that fish plays a crucial role in food and nutrition security. However, this ‘fish as food’ perspective has yet to translate into policy and development funding priorities. We argue that the traditional framing of fish as a natural resource emphasizes economic development and biodiversity conservation objectives, whereas situating fish within a food systems perspective can lead to innovative policies and investments that promote nutrition-sensitive and socially equitable capture fisheries and aquaculture. This paper highlights four pillars of research needs and policy directions toward this end. Ultimately, recognizing and working to enhance the role of fish in alleviating hunger and malnutrition can provide an additional long-term development incentive, beyond revenue generation and biodiversity conservation, for governments, international development organizations, and society more broadly to invest in the sustainability of capture fisheries and aquaculture.Electronic supplementary materialThe online version of this article (10.1007/s13280-020-01451-4) contains supplementary material, which is available to authorized users. 相似文献
504.
Luo Yaowen Yan Jianguo McClure Stephen 《Environmental science and pollution research international》2021,28(6):6587-6599
Environmental Science and Pollution Research - The COVID-19 outbreak has become a global pandemic. The spatial variation in the environmental, health, socioeconomic, and demographic risk factors of... 相似文献
505.
Zhu Feng Chen Lan Qian Zhengmin Liao Yuxue Zhang Zhen McMillin Stephen Edward Wang Xiaojie Lin Hualiang 《Environmental science and pollution research international》2021,28(28):37195-37203
Environmental Science and Pollution Research - There are relatively few studies that focus on the health effects of exposure to size-specific particles on respiratory mortality in China. We aimed... 相似文献
506.
Duarte-Guardia Sandra Peri Pablo L. Amelung Wulf Sheil Douglas Laffan Shawn W. Borchard Nils Bird Michael I. Dieleman Wouter Pepper David A. Zutta Brian Jobbagy Esteban Silva Lucas C. R. Bonser Stephen P. Berhongaray Gonzalo Piñeiro Gervasio Martinez Maria-Jose Cowie Annette L. Ladd Brenton 《Mitigation and Adaptation Strategies for Global Change》2019,24(3):355-372
Mitigation and Adaptation Strategies for Global Change - Soils hold the largest pool of organic carbon (C) on Earth; yet, soil organic carbon (SOC) reservoirs are not well represented in climate... 相似文献
507.
Anton Eitzinger Peter Läderach Beatriz Rodriguez Myles Fisher Stephen Beebe Kai Sonder Axel Schmidt 《Mitigation and Adaptation Strategies for Global Change》2017,22(5):743-760
Drybeans (Phaseolus vulgaris L.) are an important subsistence crop in Central America. Future climate change may threaten drybean production and jeopardize smallholder farmers’ food security. We estimated yield changes in drybeans due to changing climate in these countries using downscaled data from global circulation models (GCMs) in El Salvador, Guatemala, Honduras, and Nicaragua. We generated daily weather data, which we used in the Decision Support System for Agrotechnology Transfer (DSSAT) drybean submodel. We compared different cultivars, soils, and fertilizer options in three planting seasons. We analyzed the simulated yields to spatially classify high-impact spots of climate change across the four countries. The results show a corridor of reduced yields from Lake Nicaragua to central Honduras (10–38 % decrease). Yields increased in the Guatemalan highlands, towards the Atlantic coast, and in southern Nicaragua (10–41 % increase). Some farmers will be able to adapt to climate change, but others will have to change crops, which will require external support. Research institutions will need to devise technologies that allow farmers to adapt and provide policy makers with feasible strategies to implement them. 相似文献
508.
509.
Long-term studies have revealed that the structure and dynamics of many tropical forests are changing, but the causes and consequences of these changes remain debated. To learn more about the forces driving changes within tropical forests, we investigated shifts in tree species composition over the past 25 years within the 50-ha Forest Dynamics Plot on Barro Colorado Island (BCI), Panama, and examined how observed patterns relate to predictions of (1) random population fluctuations, (2) carbon fertilization, (3) succession from past disturbance, (4) recovery from an extreme El Ni?o drought at the start of the study period, and (5) long-term climate change. We found that there have been consistent and directional changes in the tree species composition. These shifts have led to increased relative representations of drought-tolerant species as determined by the species' occurrence both across a gradient of soil moisture within BCI and across a wider precipitation gradient from a dry forest near the Pacific coast of Panama to a wet forest near its Caribbean coast. These nonrandom changes cannot be explained by stochastic fluctuations or carbon fertilization. They may be the legacy of the El Ni?o drought, or alternatively, potentially reflect increased aridity due to long-term climate change. By investigating compositional changes, we increased not only our understanding of the ecology of tropical forests and their responses to large-scale disturbances, but also our ability to predict how future global change will impact some of the critical services provided by these important ecosystems. 相似文献
510.
Angela F. McGaffin Stephen Nicol Patti Virtue Yasuo Hirano Tsuyoshi Matsuda Itaru Uchida Steven G. Candy So Kawaguchi 《Marine Biology》2011,158(8):1743-1755
Antarctic krill, Euphausia superba, hatched from eggs and maintained for four years, were sampled periodically for age-pigment analysis. Extractable pigments
from the eye and eyestalk ganglia were quantified using fluorescence intensity and standardised against protein. Three peak
fluorescence intensities were detected at wavelengths of excitation 280 nm, emission 625 nm (pigment 1); excitation 355 nm,
emission 510 nm (pigment 2); and excitation 463 nm, emission 620 nm (pigment 3). There was a positive correlation between
the quantity of pigments 1 and 3 and the age of Antarctic krill. A model was developed to predict age from pigment 3 and to
compare it with other age proxies (carapace length and eyeball diameter). The quantity of pigment 3 was the best predictor
of age. The pigment method can discriminate between similar sized krill aged 12 and 36 months. Age pigments provide an improved
tool for age estimation in Antarctic krill, particularly if used in conjunction with other demographic information. 相似文献